A constitutive model for Ti6Al4V considering the state of stress and strain rate effects
Article dans une revue avec comité de lecture
JournalMechanics of Materials
The predictability of manufacturing process simulation is highly dependent on the accuracy of the constitutive model to describe the mechanical behavior of the work material. The model should consider the most relevant parameters affecting this behavior. In this study, a constitutive model for Ti6Al4V titanium alloy is proposed that considers both material plasticity and damage. It includes the effects of strain hardening, strain-rate and the state of stress to represent the mechanical behavior of Ti6Al4V titanium alloy in metal cutting simulation. To generate states of stress and strain rates representative of this process, mechanical tests were performed using a specific experimental setup. This included a specimen geometry designed to generate different states of stress, as well as a digital image correlation technique to obtain the strains during the mechanical tests. For the determination of the coefficients of the constitutive model, the yield stress and fracture locus obtained from these tests were used in an optimization-based procedure. To verify the accuracy of the proposed constitutive model to represent the mechanical behavior of the Ti6Al4V alloy under different states of stress, force–displacement curves obtained using this model and the Johnson-Cook model are compared with the curves obtained experimentally.
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Constitutive model incorporating the strain-rate and state of stress effects for machining simulation of titanium alloy Ti6Al4V Communication avec acteCHENG, Wenyu; OUTEIRO, José; COSTES, Jean-Philippe; M’SAOUBI, Rachid; KARAOUNI, Habib; DENGUIR, Lamice; ASTAKHOV, Viktor; AUZENAT, François (Elsevier, 2018)Ti6Al4V titanium alloy is widely used in aero-engines due to its superior performance. However, as a difficult-to-cut alloy, it induces short cutting tool life and poor surface integrity. To improve these process outcomes, ...
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